Unified constitutive equations of foam materials

Article Abstract:

Research was conducted to develop a unified constitutive model of foam materials based on factors such as tension strain, compression strain rate and shear strain. In this study, experiments involving two foam materials were performed. Polypropylene foam was tested with regard to shear, tension and quasi-static compression while polyurethane was tested at five compressive strain rates. Results indicated correlation between the strain rates and compressive loading.

Research, Stresses (Materials), Foam, Foams (Chemistry), Stress relaxation (Materials)

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Actual safety distance and winding tension to manufacture full section parts by robotized filament winding

Article Abstract:

A demonstration of the way to avoid the occurrence of collisions by planning the value of the actual safety distance through the definition of geometric parameters that characterize the winding trajectory is presented. Moreover, the collision occurrence should be considered together with the control of the winding tension on the roving in the robotized filament winding planning stage.

Methods, Usage, Design and construction, Robots, Robot, Winding machines, Electric windings

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Characterization of multiaxial constitutive properties of rubbery polymers

Article Abstract:

Rubbery response of polyurea was examined under monotonic loading in the confined compression, composite compression, and Arcan shear configurations. It is found that polyurea formed by a spray process shows significant compressibility, inelastic volumetric deformation, and significantly enhanced shear resistance.

Nitrogenous Fertilizer Manufacturing, Nitrogenous fertilizers, Urea, Polymeric composites, Polymer composites, Mechanical properties, Chemical properties

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